Driveshaft degrees

Does anyone know how many degrees difference the driveshaft can take without vibration? i have a 3 inch lift, I lowered the tranny about 1.5 inches (just put the spacers between the frame and crossmember). This put the output angle at 12 degrees, and the pinion angle at 7-8 degrees. How much lower can i lower the end of the tranny?
thanks for any help...

I would;t put anymore than what you already have. You may need to install a shim under the rear springs. Those angles that you have are way to far off. I just yesterday, got both my angles to match up with 8 degrees at both ends. This with the stock t-case spacer and an extra washer, and with a 4 degree shim in the rear.
If you lower your t-case any more, your going to get the front drive shaft angles way outta wack, not to mention your putting more pressure on the motor mounts, which can also cause a vidration. Also you move the fan up closer to the shroud as well. Thats about all I know about it. But yea, I think you'd benefit more with a 2 or 3 degree shim

Well, I hate to admit it but no. So I had to turn the shims back around the way they came. And I had to put an extra washer in with the spacer on the t-case, and now, my angles are both at 8 degree. And It runs pretty damn good.
I just haven't had the front hubs locked yet, so I dont know if Im going to have problems with the front shaft. I need to get it out and continue the test driving some more. But I need to get longer break lines. Before I drive it too much more. They are real close to ripping at the slightest flex.

I checked around on this before, and was told that the only place i could get some shims would be the local speed shop..
If the angle at the end of the tranny is 12, and the angle at the pinion yoke is 8, the larger side of the shim has to go to the front or rear?
Thanks Again..

it's a rough country lift. I put the blocks in just like they said. With the large side in the back...I know it cuts down on the u-joints life with the vibrations like this... I'm at the point where i think I should just take the lift out and modify the body.. At least it rode better.
any ideas for a frustrated Jimmy fan?
With all the talk on this site about new driveshafts, wedges and everything else, Why did I do this????

I feel about the same way Dewey. But once you get it right you'll be happy it over with. I still have a very slight vibration between 25 and 35, but its not too bad.
Your just going to have to play with it, trial and error.
Another thing to consider is, that when you increase or decrease the angle on one side you are also chnging th other angle as well. But not the same amount. I think it changes the opposite angle by half. So if you put 2 more degrees on the rear then the other end changes by 1. Or it may be visa versa.
But don't loose hope, you get it. Just keep tinkering with it. Try what I did, and put a washer in with the spacers to give them and extra degree. And see if that helps.

Will work for parts, beer and sex.
90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
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